Downdraft smoke-carbonizing furnace.



J. W. FOLEY.

DOWNDRAFT SMOKE OARBONIZING FURNACE.

APPLICATION nun JUNE 26, 1911.

1,019,624. Patented Mar. 5, 1912.

3 SHEETS-11231 1.

COLUMBIA PLANOORAPII C04. WASHINGTON. IL c.

J. W. FOLEY. DOWNDRAFT SMOKE OARBONIZING FURNACE.

APPLIOATION FILED JUNE 26, 1911.

Patented Mar. 5, 1912.

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QXWcueooeo I J. W. FOLEY.

DOWNDRAFT SMOKE CARBONIZING FURNACE.

APPLICATION FILED JUNE 26, 1911.

Patented Mar. 5, 1912.

3 SHEETS-SHEET 3.

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JAMES W. FOLEY, OF DENVER, COLORADO.

DOWNDRAFT SMOKE-CARBONIZING FURNACE.

Specification of Letters Patent.

Application filed June 26, 1911.

Patented Mar. 5, 1912.

Serial No. 635,384.

To all whom it may concern:

Be it known that I, JAMES W. FOLEY, citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Downdraft Smoke-Carbonizing Furnaces; and I do declare the follow ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in furnaces adapted to carbonize the smoke which originally passes from the fire-box.

In my improved construction, the smoke, as it originally leaves the fire-box, is first carried rearwardly through a main central flue, and then downwardly and forwardly through a bottom companion flue, communieating at its forward extremity with the ash-pit, and then rearwardly through side flues, the smoke being carbonized in the bottom companion flue by the employment of a jet of water. either hot or cold, or steam, which not only performs the smoke-condensing or carbonizing function, but which also serves to produce the necessary suction whereby the smoke, after reaching the rear extremity of the furnace, is carried forwardly through the bottom return flue, thus producing the necessary draft to carry the gases or uncondensed or non-carbonized properties of the smoke rearwardly and upwardly on opposite sides of the main central flue, and thence to the rear extremity of the boiler, where the heat and gases are carried through the fire tubes or act upon the tubes of a water tube boiler, as the case may be.

In my improved construction, I have shown the furnace in connection with a boiler having the usual fire flues or tubes, though it is evident that it may be employed to equal advantage in connection with water tube boilers of any type.

Having briefly outlined my improved construction, I will proceed to describe the same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof.

In this drawing: Figure 1 is a vertical longitudinal section, taken through my improved furnace, showing the boiler in elevation. Fig. 2 is a horizontal section, taken on the line 2-2 of Fig. 1, looking downwardly. Fig. 3 is a horizontal section, taken on the line 3-3 of Fig. 1, looking downwardly. Fig. 4: is a cross section, taken on the line 4-4l of Fig. 1, looking forwardly, or in the direction of the arrow adjacent said line. Fig. 5 is a horizontal section of the furnace, taken through the lower portion of a modified form of construction. This section is indicated by the line 55 of Fig. 6. Fig. 6 is a vertical section taken on the line 66, Fig. 5, looking in the direction of the arrow. Fig. 7 is a fragmentary vertical longitudinal section, taken on the line 7-7 of Fig. 6.

The same reference characters refer to the same parts in all the views.

Referring more particularly to Figs. 1 to 41, inclusive, let the numeral 5 designate the fire box, 6 the ash-pit, and 7 the bridge wall of the furnace, the ash-pit and bridge wall being equipped with openings 8 and 9, respectively, adapted to be closed by doors 10 and 12 in the usual manner. From the fire box, and occupying a position above the bridge wall, is a flue 13, entrance of which is of a width equal to the entire width of the furnace between the side walls thereof. This flue is reduced in width as it extends rearwardly, the side walls 14 of the flue appreaching each other for the purpose until a point 15 is reached, whence the walls extend rearwardly in a direction parallel with the side walls of the furnace and parallel with each other. The rear extremity 16 of the flue 13 is in communication with a bottom companion flue 17, located directly below the main, top flue 13, the forward extremity of the flue 17 communicating with the ash-pit of the furnace. On opposite sides of the bottom central flue 17, and lying in the same plane therewith, are two additional flues 18, which at their forward extremities communicate with the ash-pit, and whose upper extremities are curved upwardly, as shown at 19, their upper extremities being open, as shown at 20, and communicating with chambers 21 on opposite sides of the side walls 22 of the flue 13, the chambers 21 being completely separated from the rear extremities of the flues 13 and 17. At the rear extremity 16 of the flue 13 is a water or steam jet tube 23, whose forward extremity is equipped with a nozzle 24, the rear extremity of the tube or pipe 23 being in communication with the vertically-disposed pipe 25, the latter being in communication with branch pipes 26 and 27. These pipes 25, 26 and 27 may be employed to respectively introduce steam, hot water, or cold water, to the pipe 23 and nozzle 24 for the purpose of condensing or carbonizing the smoke in the return flue 17', the remaining gases or uncondensable products or elements of the smoke being carried to the ash-pit and thence rearwardly therefrom through the bottom side flues 18, and thence with the heat from the fire box rearwardly and upwardly through the fire tubes or fines of the boiler 28.

From the foregoingdescription, the use and operation of my improved down-draft smoke-carbonizing furnace will be readily understood. The products of combustion from the fire-box 5, including the heat and smoke, will pass originally rearwardly from the fire-box, over the bridge wall, (which tapers downwardly as it extends rearwardly),--and thence to the rear extremity of the furnace. The fluid jet, issuing from the nozzle 24 of the pipe 23, will produce a suction which will draw the smoke downwardly and cause it to pass forwardly through the bottom centrally located companion flue 17. In this flue, the unconsumed fuel or carbon portion of the smoke is condensed or carbonized, the heat and gases, however, passing forwardly into the ash-pit and thence rearwardly through the bottom side flues 18, and thence upwardly from said flues into the side chambers 21, and thence through the fire tubes of the boiler.

It will be noted that the rear extremity 16 of the flue 13 is closed at the top in the rear of the boiler, as shown at 29, whereby the products of combustion are prevented from passing upwardly through the fire tubes of the boiler, being compelled to move downwardly and take their proper course through the bottom flue 17 through the instrumentality of the jet of water or steam issuing from the nozzle 24, as heretofore explained. Furthermore, the chambers 21 on opposite sides of the flue 13, and communicating with the rear extremities of the flues 18, are closed above the top plate 29 on opposite sides, as shown at 30, thus preventing any possible communication between the side chambers 21 and the rear extremity of the flue 13, except by way of the bottom flue 17 and the side flue 18.

In the form of construction shown in Fig. 5, the main flues 13 and 17 are substantially of the same construction as illustrated in the other views. On the contrary, the side flues 18 extend rearwardly farther than the flues 18 in the other form of construction.

In other words, in Figs. 5, 6 and 7, the flues 18 extend rearwardly to the rear extremity of the boiler, and thence upwardly through side chambers 31, and communicate with the fire tubes or flues of the boiler at their rear extremities, as in the other form of construction. In other respects, the operation of my improvement is the same as in the other form of the apparatus.

The rear wall of the furnace is provided with three openings designated 32, 32 and 34, respectively, the two openings 32 being directly in line with the flues 18, while the opening 34 is directly in line with the central flue 17. This opening 34 may be large enough to enable a man to enter the furnace for the purpose of cleaning out the carbonized smoke, while the openings 32 may be employed for cleaning out'the chamber compartments 21 in the form of construction shown in Figs. 1 to 4, inclusive; and to clean out the flues 18 as well as the said chamber compartments in the form of construction shown in Figs. 5 to 7, inclusive. The openings 32 are normally closed by doors 33, while the opening 34 is normally closed by a door 35.

Having thus described my invention, what I claim is:

1. A down-draft smoke-carbonizing furnace equipped with an upper flue leading rearwardly from the fire-box, a lower flue leading forwardly to the ash-pit from "the rear extremity of the upper flue and in communication therewith, and a flue leading rearwardly from the ash-pit and having its forward extremity in communication with the forward end of the said lower flue, the last named rearwardly-extending flue having its rear extremity in communication with the stack, the rear extremity of the main upper flue being cut off from the stack.

2. A furnace of the class described equipped with a main top flue leading rearwardly from the fire-box, a chamber in the rear extremity of the furnace with which the rear end of the said flue is in communication, the said chamber being cut ofi from communication with the stack, a bottom companion flue leading forwardly from the said chamber to the ash-pit, means located at the rear extremity of the lastnamed flue and producing suction therethrough in the direction of the ash-pit, and carbonizing the smoke therein, and flues extending rearwardly from the ash-pit, their rear extremities being in communication with the stack, substantially as described.

3. A furnace of the class described,

equipped with a top flue leading rearwardly from the fire-box, its rear extremity being cut off from the stack, a companion flue extending forwardly to the ash-pit, its rear extremity being in communication with the said top flue, a fluid jet located at therear extremity of the bottom companion flue for In testimony whereof I affix my signature producing suction therethrough in the direcin presence of two Witnesses.

tion of the ash-pit, and carbonizin' the smoke therein, and a bottom flue leiding JAMES FOLEY 5 rearwardly from the ash-pit, its rear ex- Witnesses:

tremity being in communication With the CLORA E. BRADEN,

stack, substantially as described. F. E. BOWEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. i 

